To get a UTR number, you must register for Self Assessment with HM Revenue & Customs (HMRC). This 10-digit Unique Taxpayer Reference is automatically generated and sent by post after you notify HMRC that you are self-employed, a company director, or receiving untaxed income.
There is no way to apply for the number in isolation. How do I get a UTR number if I have never filed a tax return before?
Navigating the UK tax system for the first time often feels like learning a new language, and identifying your unique reference is the first hurdle most new business owners face.
In 2026, the process is intrinsically linked to your digital Government Gateway identity, acting as the primary key for all your interactions with the tax office.
How do I get a UTR number for the first time?
To obtain a 10-digit Unique Taxpayer Reference, you must register for the Self Assessment service via the official GOV.UK portal.
Once HMRC processes your registration as a sole trader, partner, or individual with untaxed income, they will generate the reference and dispatch it to your registered home address via physical mail.
Your UTR is a permanent digital identifier
It is a common misconception that a UTR is something you order like a certificate. In reality, the UTR is a permanent identifier assigned to your tax account for life.
Even if you stop being self-employed and return to it years later, your UTR remains the same. In my experience helping local startups, the biggest hurdle isn’t the application itself, but the waiting period for the activation code that follows the initial registration.
| Entity Type | Registration Method | Automatic UTR? |
| Sole Trader | Register via CWF1 form online | Yes, by post |
| Limited Company | Companies House registration | Yes, sent to the registered office |
| Landlord / Investor | Register via SA1 form online | Yes, by post |
| Trusts / Charities | Form online or paper | Yes, after validation |
What are the steps to register with HMRC?
The process has become strictly digital as HMRC moves closer to full implementation of Making Tax Digital (MTD). Following these steps ensures you don’t trigger a manual review, which can delay your number by weeks.
- Create a Government Gateway user ID: You will need a valid email address to set up your secure login credentials.
- Verify your identity: Have your National Insurance number and either a UK passport or a P60 from a recent employer ready.
- Choose your registration type: Select Self-employed if you are a sole trader or Register for Self Assessment if you have other income (e.g., property).
- Submit business details: Provide your business start date, nature of work, and contact telephone number.
- Wait for the post: HMRC will send a letter containing your 10-digit UTR within 10 to 15 working days.
- Activate the service: A separate activation code usually arrives shortly after, allowing you to link your UTR to your online account.
Common registration hurdles
I recently worked with a freelance consultant who moved house the same week they registered. Because HMRC sends the UTR to the address held on their central records (often linked to your National Insurance data), the letter went to their old flat.
Always ensure your address is updated on your Personal Tax Account before you trigger a UTR request. Misaligned data is a leading cause of registration rejection or tax calculation errors.
Data accuracy is the foundation of a smooth registration. For those transitioning from employment, ensuring your records reflect your current status is vital; for instance, understanding how to change tax code details within your account can prevent you from being placed on an expensive emergency tax bracket while your new business reference is being processed.
When should you expect your tax reference to arrive?
The timeline for receiving your reference depends heavily on the time of year. While the standard window is 10–15 working days, this can stretch significantly during the January Rush or near the October 5th registration deadline.
- Standard Online Application: 10 working days.
- Paper Form Submission: 15–21 working days.
- Overseas Applicants: 21+ working days.
Essential identification requirements
To complete the registration without errors, you should have a specific set of documents at your side. Missing just one detail can lead to a rejected application.
- Your full legal name and current residential address.
- A valid National Insurance (NI) number.
- Your date of birth.
- A contact telephone number and email.
- The date you started your self-employed activity.
- Business address and business telephone number (if different).
How do I get a UTR number for a Limited Company?
If you have recently incorporated a business, you do not need to register separately for a UTR. Within a few weeks of your company being registered at Companies House, HMRC will automatically send a letter (form CT41G) to your company’s registered office address.
Differences in business identifiers
It is vital to distinguish between your personal reference and the company’s reference. As a director, you may need a personal UTR for your own tax return, while your company uses its own distinct 10-digit code for Corporation Tax.
| Feature | Personal UTR | Company UTR |
| Digits | 10 numbers | 10 numbers |
| Used for | Self Assessment | Corporation Tax |
| Source | Personal registration | Automatic after incorporation |
| Duration | Valid for life | Valid for company life |
Can I find my UTR number if I have lost it?
If you have been registered in the past but cannot find your 10-digit code, you do not need to apply for a new one. In fact, attempting to register a second time can cause significant administrative conflicts within HMRC’s database.
Where to find a lost or misplaced reference
In practice, the fastest way to recover a lost reference is through the official HMRC App or your Personal Tax Account online.
If you have any previous correspondence from the tax office, such as a Notice to File or a payment reminder, your UTR will be clearly printed in the top right-hand corner.
- Check previous tax returns (SA100 forms).
- View your Account Summary on the Government Gateway.
- Look for the Welcome to Self Assessment letter (SA250).
- Check payment receipts if you have paid tax in previous years.
It is important to remember that for data protection reasons, HMRC staff are strictly prohibited from disclosing UTRs over the telephone. If your online search proves unsuccessful, you must request a physical confirmation letter, which typically arrives by post within 10 working days.
Are there specific deadlines for getting a UTR?
Timing is everything when it comes to HMRC compliance. If you started a business or earned untaxed income between 6 April 2025 and 5 April 2026, you must have your UTR and be registered by 5 October 2026.
Failing to notify HMRC by this date can result in failure to notify penalties, which are calculated as a percentage of the tax due.
Summary of key tax identifiers
| Document | Purpose | Who issues it? |
| UTR | Identifies you for all tax matters | HMRC |
| NI Number | Tracks your benefits and state pension | DWP |
| CRN | Company Registration Number | Companies House |
| VAT Number | Only if your turnover exceeds £90k | HMRC |
Your National Insurance number serves as your primary link to the wider social security and pension network managed by the Department for Work and Pensions.
This data link has become increasingly central to government compliance, particularly with the rollout of DWP bank account checks 2026 initiatives designed to ensure financial transparency across all state-related claims.
Keeping both your HMRC and DWP profiles updated with your current address is the most effective way to avoid administrative red flags during your business journey.
Managing your tax obligations moving forward
Securing your 10-digit reference is the first milestone in your journey as a UK taxpayer. Once your official HMRC letter arrives, store it as a primary business document, as you will require it for every future filing, payment, and correspondence.
Your focus should now shift toward maintaining digital records that satisfy the latest Making Tax Digital requirements.
FAQ
Can I get a UTR number immediately?
Unfortunately, there is no instant way to receive a UTR. While the digital registration takes only a few minutes to complete, the physical verification letter is a mandatory security step that requires 10 to 15 working days for delivery.
Is a UTR number the same as a National Insurance number?
Not at all; they serve entirely different purposes. Your National Insurance number tracks your contributions for benefits and the state pension, whereas your UTR is exclusively used for filing and paying tax through Self Assessment.
Does it cost money to get a UTR?
Getting a UTR number is completely free via the GOV.UK website. Be wary of third-party websites that charge a fee to process your application; they are unnecessary intermediaries.
Many users who accidentally pay these non-official sites often struggle to reclaim their funds. While many ask how long does a PayPal refund take after realizing they have used a third-party service, the reality is that official government registrations are always free when done directly.
Always stick to official GOV.UK domains to protect your banking details and avoid unnecessary costs.
Do I need a UTR if I am employed via PAYE?
Generally, no. If your only income is from a salary where tax is deducted by your employer, you don’t need a UTR. You only need one if you have additional untaxed income.
Can I apply for a UTR without a National Insurance number?
Yes, but it is more complex. You will usually need to post a paper form (SA1) and provide alternative proof of identity, which significantly slows down the issuance of your 10-digit code.
Does a UTR number expire?
A UTR does not expire, but your Self Assessment record can be closed if you tell HMRC you no longer need to file. You can reactivate the same number later if needed.
Where is the UTR number on my tax return?
The UTR is located on the first page of your tax return (SA100) or on any official Notice to File letter sent by HMRC, usually in the top right corner.
